What is the shape of Fibre tapers?

Shape of Fiber Tapers

Fiber tapers are a fundamental component in the field of optical engineering, playing a crucial role in applications ranging from telecommunications to sensing technologies. The shape of fiber tapers is pivotal in determining their optical properties and functionality.


A fiber taper is a section of optical fiber that has been heated and stretched, resulting in a gradual change in its diameter. This process creates a tapered region where the fiber's diameter transitions from its original size to a smaller size, and potentially back to its original size again.

Shapes of Fiber Tapers

The shape of a fiber taper is primarily determined by the tapering process and the intended application. The most common shapes include:

  • Linear Taper: The diameter changes linearly along the length of the taper. This is the simplest form of a taper and is often used in applications requiring a straightforward mode transformation.
  • Exponential Taper: The diameter changes exponentially, providing a smoother transition that minimizes optical losses. This shape is preferred in applications where minimizing signal loss is critical.
  • Parabolic Taper: The diameter changes follow a parabolic curve, offering an intermediate option between linear and exponential tapers. This shape is useful for specific mode conversion applications.
  • Biconical Taper: This shape features two conical sections with the taper's narrowest point at the center. Biconical tapers are effective in coupling light between fibers of different diameters.

In conclusion, the shape of fiber tapers is a key factor in their optical performance, affecting how light is transmitted, coupled, or transformed within the fiber. By carefully designing the taper shape, optical engineers can optimize fiber tapers for a wide range of applications, from high-speed data transmission to sensitive measurement systems.

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